The TS series (pre KAMA) have been imported many years. I have ordered (and received) many parts for early 1990's TS tractors. They didn't really take off as well as they might have because they only used two cylinder engines. The Chassis of the TS series is long proven and is reported to be the most widely used 30HP class chassis in the Chinese home market. The KM series was designed with export in mind (as is the case with all KAMA branded products, from genrators to bandsaws, etc). Duetz Fahr had input on the design and it has proven to be even more reliable than the TS series. The KMs have been coming to the US for a few years and sold under various names. Of course you will hear more about Jinmas, they are sold in the thousands each year where KAMAs are sold in the hundreds, remember, only a relatively small sample of owners participate in these forums, usually those looking for help, so it does slant the picture slightly.
I personally think the KAMA KM series is the best bang for the buck in the 45/50hp class, it is priced low, even by Chinese standards and in that class, I think there are many more KMs here in the US than JMs.
I have also seen an improvement in the Jinma and Farm Pro tractors we sell. The fit and finish and cosmetics continue to improve as well as assembly quality. The KAMA 35 and JIMNA 35 are the most competitive with each other in my opinion and the choice between them becomes a matter of personal preference and choice of dealer. But for a little more money than these 30/35HP tractors, you get so much more in the KAMA KM 454, just my slightly biased, but heartfelt opinion.